void GrInOrderDrawBuffer::onDrawRect(const SkRect& rect,
const SkRect* localRect,
const SkMatrix* localMatrix) {
GrDrawState* drawState = this->drawState();
GrColor color = drawState->getColor();
set_vertex_attributes(drawState, SkToBool(localRect), color);
AutoReleaseGeometry geo(this, 4, 0);
if (!geo.succeeded()) {
SkDebugf("Failed to get space for vertices!\n");
return;
}
// Go to device coords to allow batching across matrix changes
SkMatrix matrix = drawState->getViewMatrix();
// When the caller has provided an explicit source rect for a stage then we don't want to
// modify that stage's matrix. Otherwise if the effect is generating its source rect from
// the vertex positions then we have to account for the view matrix change.
GrDrawState::AutoViewMatrixRestore avmr;
if (!avmr.setIdentity(drawState)) {
return;
}
size_t vstride = drawState->getVertexStride();
geo.positions()->setRectFan(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, vstride);
matrix.mapPointsWithStride(geo.positions(), vstride, 4);
SkRect devBounds;
// since we already computed the dev verts, set the bounds hint. This will help us avoid
// unnecessary clipping in our onDraw().
get_vertex_bounds(geo.vertices(), vstride, 4, &devBounds);
if (localRect) {
static const int kLocalOffset = sizeof(SkPoint) + sizeof(GrColor);
SkPoint* coords = GrTCast<SkPoint*>(GrTCast<intptr_t>(geo.vertices()) + kLocalOffset);
coords->setRectFan(localRect->fLeft, localRect->fTop,
localRect->fRight, localRect->fBottom,
vstride);
if (localMatrix) {
localMatrix->mapPointsWithStride(coords, vstride, 4);
}
}
static const int kColorOffset = sizeof(SkPoint);
GrColor* vertColor = GrTCast<GrColor*>(GrTCast<intptr_t>(geo.vertices()) + kColorOffset);
for (int i = 0; i < 4; ++i) {
*vertColor = color;
vertColor = (GrColor*) ((intptr_t) vertColor + vstride);
}
this->setIndexSourceToBuffer(this->getContext()->getQuadIndexBuffer());
this->drawIndexedInstances(kTriangles_GrPrimitiveType, 1, 4, 6, &devBounds);
// to ensure that stashing the drawState ptr is valid
SkASSERT(this->drawState() == drawState);
}
void GrOptDrawState::copyEffectiveColorStages(const GrDrawState& ds) {
int firstColorStage = 0;
// Set up color and flags for ConstantColorComponent checks
GrColor color;
uint32_t validComponentFlags;
if (!this->hasColorVertexAttribute()) {
color = ds.getColor();
validComponentFlags = kRGBA_GrColorComponentFlags;
} else {
if (ds.vertexColorsAreOpaque()) {
color = 0xFF << GrColor_SHIFT_A;
validComponentFlags = kA_GrColorComponentFlag;
} else {
validComponentFlags = 0;
color = 0; // not strictly necessary but we get false alarms from tools about uninit.
}
}
for (int i = 0; i < ds.numColorStages(); ++i) {
const GrFragmentProcessor* fp = ds.getColorStage(i).getFragmentProcessor();
if (!fp->willUseInputColor()) {
firstColorStage = i;
fInputColorIsUsed = false;
}
fp->getConstantColorComponents(&color, &validComponentFlags);
if (kRGBA_GrColorComponentFlags == validComponentFlags) {
firstColorStage = i + 1;
fColor = color;
fInputColorIsUsed = true;
this->removeFixedFunctionVertexAttribs(0x1 << kColor_GrVertexAttribBinding);
}
}
if (firstColorStage < ds.numColorStages()) {
fColorStages.reset(&ds.getColorStage(firstColorStage),
ds.numColorStages() - firstColorStage);
} else {
fColorStages.reset();
}
}
GrOptDrawState::GrOptDrawState(const GrDrawState& drawState,
BlendOptFlags blendOptFlags,
GrBlendCoeff optSrcCoeff,
GrBlendCoeff optDstCoeff,
const GrDrawTargetCaps& caps) : INHERITED(drawState) {
fColor = drawState.getColor();
fCoverage = drawState.getCoverage();
fViewMatrix = drawState.getViewMatrix();
fBlendConstant = drawState.getBlendConstant();
fFlagBits = drawState.getFlagBits();
fVAPtr = drawState.getVertexAttribs();
fVACount = drawState.getVertexAttribCount();
fVAStride = drawState.getVertexStride();
fStencilSettings = drawState.getStencil();
fDrawFace = drawState.getDrawFace();
fBlendOptFlags = blendOptFlags;
fSrcBlend = optSrcCoeff;
fDstBlend = optDstCoeff;
memcpy(fFixedFunctionVertexAttribIndices,
drawState.getFixedFunctionVertexAttribIndices(),
sizeof(fFixedFunctionVertexAttribIndices));
fInputColorIsUsed = true;
fInputCoverageIsUsed = true;
if (drawState.hasGeometryProcessor()) {
fGeometryProcessor.reset(SkNEW_ARGS(GrGeometryStage, (*drawState.getGeometryProcessor())));
} else {
fGeometryProcessor.reset(NULL);
}
this->copyEffectiveColorStages(drawState);
this->copyEffectiveCoverageStages(drawState);
this->adjustFromBlendOpts();
this->getStageStats();
this->setOutputStateInfo(caps);
};
void GrGLProgramDesc::Build(const GrDrawState& drawState,
bool isPoints,
GrDrawState::BlendOptFlags blendOpts,
GrBlendCoeff srcCoeff,
GrBlendCoeff dstCoeff,
const GrGpuGL* gpu,
const GrDeviceCoordTexture* dstCopy,
SkTArray<const GrEffectStage*, true>* colorStages,
SkTArray<const GrEffectStage*, true>* coverageStages,
GrGLProgramDesc* desc) {
colorStages->reset();
coverageStages->reset();
// This should already have been caught
SkASSERT(!(GrDrawState::kSkipDraw_BlendOptFlag & blendOpts));
bool skipCoverage = SkToBool(blendOpts & GrDrawState::kEmitTransBlack_BlendOptFlag);
bool skipColor = SkToBool(blendOpts & (GrDrawState::kEmitTransBlack_BlendOptFlag |
GrDrawState::kEmitCoverage_BlendOptFlag));
int firstEffectiveColorStage = 0;
bool inputColorIsUsed = true;
if (!skipColor) {
firstEffectiveColorStage = drawState.numColorStages();
while (firstEffectiveColorStage > 0 && inputColorIsUsed) {
--firstEffectiveColorStage;
const GrEffect* effect = drawState.getColorStage(firstEffectiveColorStage).getEffect()->get();
inputColorIsUsed = effect->willUseInputColor();
}
}
int firstEffectiveCoverageStage = 0;
bool inputCoverageIsUsed = true;
if (!skipCoverage) {
firstEffectiveCoverageStage = drawState.numCoverageStages();
while (firstEffectiveCoverageStage > 0 && inputCoverageIsUsed) {
--firstEffectiveCoverageStage;
const GrEffect* effect = drawState.getCoverageStage(firstEffectiveCoverageStage).getEffect()->get();
inputCoverageIsUsed = effect->willUseInputColor();
}
}
// The descriptor is used as a cache key. Thus when a field of the
// descriptor will not affect program generation (because of the attribute
// bindings in use or other descriptor field settings) it should be set
// to a canonical value to avoid duplicate programs with different keys.
bool requiresColorAttrib = !skipColor && drawState.hasColorVertexAttribute();
bool requiresCoverageAttrib = !skipCoverage && drawState.hasCoverageVertexAttribute();
// we only need the local coords if we're actually going to generate effect code
bool requiresLocalCoordAttrib = !(skipCoverage && skipColor) &&
drawState.hasLocalCoordAttribute();
bool colorIsTransBlack = SkToBool(blendOpts & GrDrawState::kEmitTransBlack_BlendOptFlag);
bool colorIsSolidWhite = (blendOpts & GrDrawState::kEmitCoverage_BlendOptFlag) ||
(!requiresColorAttrib && 0xffffffff == drawState.getColor()) ||
(!inputColorIsUsed);
int numEffects = (skipColor ? 0 : (drawState.numColorStages() - firstEffectiveColorStage)) +
(skipCoverage ? 0 : (drawState.numCoverageStages() - firstEffectiveCoverageStage));
size_t newKeyLength = KeyLength(numEffects);
bool allocChanged;
desc->fKey.reset(newKeyLength, SkAutoMalloc::kAlloc_OnShrink, &allocChanged);
if (allocChanged || !desc->fInitialized) {
// make sure any padding in the header is zero if we we haven't used this allocation before.
memset(desc->header(), 0, kHeaderSize);
}
// write the key length
*desc->atOffset<uint32_t, kLengthOffset>() = SkToU32(newKeyLength);
KeyHeader* header = desc->header();
EffectKey* effectKeys = desc->effectKeys();
int currEffectKey = 0;
bool readsDst = false;
bool readFragPosition = false;
bool hasVertexCode = false;
if (!skipColor) {
for (int s = firstEffectiveColorStage; s < drawState.numColorStages(); ++s) {
effectKeys[currEffectKey++] =
get_key_and_update_stats(drawState.getColorStage(s), gpu->glCaps(),
requiresLocalCoordAttrib, &readsDst, &readFragPosition,
&hasVertexCode);
}
}
if (!skipCoverage) {
for (int s = firstEffectiveCoverageStage; s < drawState.numCoverageStages(); ++s) {
effectKeys[currEffectKey++] =
get_key_and_update_stats(drawState.getCoverageStage(s), gpu->glCaps(),
requiresLocalCoordAttrib, &readsDst, &readFragPosition,
&hasVertexCode);
}
}
header->fHasVertexCode = hasVertexCode || requiresLocalCoordAttrib;
header->fEmitsPointSize = isPoints;
// Currently the experimental GS will only work with triangle prims (and it doesn't do anything
// other than pass through values from the VS to the FS anyway).
#if GR_GL_EXPERIMENTAL_GS
#if 0
header->fExperimentalGS = gpu->caps().geometryShaderSupport();
#else
header->fExperimentalGS = false;
#endif
#endif
bool defaultToUniformInputs = GR_GL_NO_CONSTANT_ATTRIBUTES || gpu->caps()->pathRenderingSupport();
if (colorIsTransBlack) {
header->fColorInput = kTransBlack_ColorInput;
} else if (colorIsSolidWhite) {
header->fColorInput = kSolidWhite_ColorInput;
} else if (defaultToUniformInputs && !requiresColorAttrib) {
header->fColorInput = kUniform_ColorInput;
} else {
header->fColorInput = kAttribute_ColorInput;
header->fHasVertexCode = true;
}
bool covIsSolidWhite = !requiresCoverageAttrib && 0xffffffff == drawState.getCoverageColor();
if (skipCoverage) {
header->fCoverageInput = kTransBlack_ColorInput;
} else if (covIsSolidWhite || !inputCoverageIsUsed) {
header->fCoverageInput = kSolidWhite_ColorInput;
} else if (defaultToUniformInputs && !requiresCoverageAttrib) {
header->fCoverageInput = kUniform_ColorInput;
} else {
header->fCoverageInput = kAttribute_ColorInput;
header->fHasVertexCode = true;
}
if (readsDst) {
SkASSERT(NULL != dstCopy || gpu->caps()->dstReadInShaderSupport());
const GrTexture* dstCopyTexture = NULL;
if (NULL != dstCopy) {
dstCopyTexture = dstCopy->texture();
}
header->fDstReadKey = GrGLShaderBuilder::KeyForDstRead(dstCopyTexture, gpu->glCaps());
SkASSERT(0 != header->fDstReadKey);
} else {
header->fDstReadKey = 0;
}
if (readFragPosition) {
header->fFragPosKey = GrGLShaderBuilder::KeyForFragmentPosition(drawState.getRenderTarget(),
gpu->glCaps());
} else {
header->fFragPosKey = 0;
}
// Record attribute indices
header->fPositionAttributeIndex = drawState.positionAttributeIndex();
header->fLocalCoordAttributeIndex = drawState.localCoordAttributeIndex();
// For constant color and coverage we need an attribute with an index beyond those already set
int availableAttributeIndex = drawState.getVertexAttribCount();
if (requiresColorAttrib) {
header->fColorAttributeIndex = drawState.colorVertexAttributeIndex();
} else if (GrGLProgramDesc::kAttribute_ColorInput == header->fColorInput) {
SkASSERT(availableAttributeIndex < GrDrawState::kMaxVertexAttribCnt);
header->fColorAttributeIndex = availableAttributeIndex;
availableAttributeIndex++;
} else {
header->fColorAttributeIndex = -1;
}
if (requiresCoverageAttrib) {
header->fCoverageAttributeIndex = drawState.coverageVertexAttributeIndex();
} else if (GrGLProgramDesc::kAttribute_ColorInput == header->fCoverageInput) {
SkASSERT(availableAttributeIndex < GrDrawState::kMaxVertexAttribCnt);
header->fCoverageAttributeIndex = availableAttributeIndex;
} else {
header->fCoverageAttributeIndex = -1;
}
// Here we deal with whether/how we handle color and coverage separately.
// Set this default and then possibly change our mind if there is coverage.
header->fCoverageOutput = kModulate_CoverageOutput;
// If we do have coverage determine whether it matters.
bool separateCoverageFromColor = false;
if (!drawState.isCoverageDrawing() && !skipCoverage &&
(drawState.numCoverageStages() > 0 || requiresCoverageAttrib)) {
if (gpu->caps()->dualSourceBlendingSupport() &&
!(blendOpts & (GrDrawState::kEmitCoverage_BlendOptFlag |
GrDrawState::kCoverageAsAlpha_BlendOptFlag))) {
if (kZero_GrBlendCoeff == dstCoeff) {
// write the coverage value to second color
header->fCoverageOutput = kSecondaryCoverage_CoverageOutput;
separateCoverageFromColor = true;
} else if (kSA_GrBlendCoeff == dstCoeff) {
// SA dst coeff becomes 1-(1-SA)*coverage when dst is partially covered.
header->fCoverageOutput = kSecondaryCoverageISA_CoverageOutput;
separateCoverageFromColor = true;
} else if (kSC_GrBlendCoeff == dstCoeff) {
// SA dst coeff becomes 1-(1-SA)*coverage when dst is partially covered.
header->fCoverageOutput = kSecondaryCoverageISC_CoverageOutput;
separateCoverageFromColor = true;
}
} else if (readsDst &&
kOne_GrBlendCoeff == srcCoeff &&
kZero_GrBlendCoeff == dstCoeff) {
header->fCoverageOutput = kCombineWithDst_CoverageOutput;
separateCoverageFromColor = true;
}
}
if (!skipColor) {
for (int s = firstEffectiveColorStage; s < drawState.numColorStages(); ++s) {
colorStages->push_back(&drawState.getColorStage(s));
}
}
if (!skipCoverage) {
SkTArray<const GrEffectStage*, true>* array;
if (separateCoverageFromColor) {
array = coverageStages;
} else {
array = colorStages;
}
for (int s = firstEffectiveCoverageStage; s < drawState.numCoverageStages(); ++s) {
array->push_back(&drawState.getCoverageStage(s));
}
}
header->fColorEffectCnt = colorStages->count();
header->fCoverageEffectCnt = coverageStages->count();
*desc->checksum() = 0;
*desc->checksum() = SkChecksum::Compute(reinterpret_cast<uint32_t*>(desc->fKey.get()),
newKeyLength);
desc->fInitialized = true;
}
void GrInOrderDrawBuffer::onDrawRect(const GrRect& rect,
const SkMatrix* matrix,
const GrRect* localRect,
const SkMatrix* localMatrix) {
GrDrawState::AutoColorRestore acr;
GrDrawState* drawState = this->drawState();
GrColor color = drawState->getColor();
int colorOffset, localOffset;
set_vertex_attributes(drawState,
this->caps()->dualSourceBlendingSupport() || drawState->hasSolidCoverage(),
NULL != localRect,
&colorOffset, &localOffset);
if (colorOffset >= 0) {
// We set the draw state's color to white here. This is done so that any batching performed
// in our subclass's onDraw() won't get a false from GrDrawState::op== due to a color
// mismatch. TODO: Once vertex layout is owned by GrDrawState it should skip comparing the
// constant color in its op== when the kColor layout bit is set and then we can remove
// this.
acr.set(drawState, 0xFFFFFFFF);
}
AutoReleaseGeometry geo(this, 4, 0);
if (!geo.succeeded()) {
GrPrintf("Failed to get space for vertices!\n");
return;
}
// Go to device coords to allow batching across matrix changes
SkMatrix combinedMatrix;
if (NULL != matrix) {
combinedMatrix = *matrix;
} else {
combinedMatrix.reset();
}
combinedMatrix.postConcat(drawState->getViewMatrix());
// When the caller has provided an explicit source rect for a stage then we don't want to
// modify that stage's matrix. Otherwise if the effect is generating its source rect from
// the vertex positions then we have to account for the view matrix change.
GrDrawState::AutoViewMatrixRestore avmr;
if (!avmr.setIdentity(drawState)) {
return;
}
size_t vsize = drawState->getVertexSize();
geo.positions()->setRectFan(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, vsize);
combinedMatrix.mapPointsWithStride(geo.positions(), vsize, 4);
SkRect devBounds;
// since we already computed the dev verts, set the bounds hint. This will help us avoid
// unnecessary clipping in our onDraw().
get_vertex_bounds(geo.vertices(), vsize, 4, &devBounds);
if (localOffset >= 0) {
GrPoint* coords = GrTCast<GrPoint*>(GrTCast<intptr_t>(geo.vertices()) + localOffset);
coords->setRectFan(localRect->fLeft, localRect->fTop,
localRect->fRight, localRect->fBottom,
vsize);
if (NULL != localMatrix) {
localMatrix->mapPointsWithStride(coords, vsize, 4);
}
}
if (colorOffset >= 0) {
GrColor* vertColor = GrTCast<GrColor*>(GrTCast<intptr_t>(geo.vertices()) + colorOffset);
for (int i = 0; i < 4; ++i) {
*vertColor = color;
vertColor = (GrColor*) ((intptr_t) vertColor + vsize);
}
}
this->setIndexSourceToBuffer(this->getContext()->getQuadIndexBuffer());
this->drawIndexedInstances(kTriangles_GrPrimitiveType, 1, 4, 6, &devBounds);
// to ensure that stashing the drawState ptr is valid
GrAssert(this->drawState() == drawState);
}
void GrGLProgramDesc::Build(const GrDrawState& drawState,
bool isPoints,
GrDrawState::BlendOptFlags blendOpts,
GrBlendCoeff srcCoeff,
GrBlendCoeff dstCoeff,
const GrGpuGL* gpu,
const GrDeviceCoordTexture* dstCopy,
GrGLProgramDesc* desc) {
// This should already have been caught
GrAssert(!(GrDrawState::kSkipDraw_BlendOptFlag & blendOpts));
bool skipCoverage = SkToBool(blendOpts & GrDrawState::kEmitTransBlack_BlendOptFlag);
bool skipColor = SkToBool(blendOpts & (GrDrawState::kEmitTransBlack_BlendOptFlag |
GrDrawState::kEmitCoverage_BlendOptFlag));
// The descriptor is used as a cache key. Thus when a field of the
// descriptor will not affect program generation (because of the attribute
// bindings in use or other descriptor field settings) it should be set
// to a canonical value to avoid duplicate programs with different keys.
desc->fEmitsPointSize = isPoints;
bool requiresColorAttrib = !skipColor && drawState.hasColorVertexAttribute();
bool requiresCoverageAttrib = !skipCoverage && drawState.hasCoverageVertexAttribute();
// we only need the local coords if we're actually going to generate effect code
bool requiresLocalCoordAttrib = !(skipCoverage && skipColor) &&
drawState.hasLocalCoordAttribute();
// fColorInput/fCoverageInput records how colors are specified for the program so we strip the
// bits from the bindings to avoid false negatives when searching for an existing program in the
// cache.
desc->fColorFilterXfermode = skipColor ? SkXfermode::kDst_Mode : drawState.getColorFilterMode();
bool colorIsTransBlack = SkToBool(blendOpts & GrDrawState::kEmitTransBlack_BlendOptFlag);
bool colorIsSolidWhite = (blendOpts & GrDrawState::kEmitCoverage_BlendOptFlag) ||
(!requiresColorAttrib && 0xffffffff == drawState.getColor());
if (colorIsTransBlack) {
desc->fColorInput = kTransBlack_ColorInput;
} else if (colorIsSolidWhite) {
desc->fColorInput = kSolidWhite_ColorInput;
} else if (GR_GL_NO_CONSTANT_ATTRIBUTES && !requiresColorAttrib) {
desc->fColorInput = kUniform_ColorInput;
} else {
desc->fColorInput = kAttribute_ColorInput;
}
bool covIsSolidWhite = !requiresCoverageAttrib && 0xffffffff == drawState.getCoverage();
if (skipCoverage) {
desc->fCoverageInput = kTransBlack_ColorInput;
} else if (covIsSolidWhite) {
desc->fCoverageInput = kSolidWhite_ColorInput;
} else if (GR_GL_NO_CONSTANT_ATTRIBUTES && !requiresCoverageAttrib) {
desc->fCoverageInput = kUniform_ColorInput;
} else {
desc->fCoverageInput = kAttribute_ColorInput;
}
bool readsDst = false;
int lastEnabledStage = -1;
for (int s = 0; s < GrDrawState::kNumStages; ++s) {
bool skip = s < drawState.getFirstCoverageStage() ? skipColor : skipCoverage;
if (!skip && drawState.isStageEnabled(s)) {
lastEnabledStage = s;
const GrEffectRef& effect = *drawState.getStage(s).getEffect();
const GrBackendEffectFactory& factory = effect->getFactory();
GrDrawEffect drawEffect(drawState.getStage(s), requiresLocalCoordAttrib);
desc->fEffectKeys[s] = factory.glEffectKey(drawEffect, gpu->glCaps());
if (effect->willReadDst()) {
readsDst = true;
}
} else {
desc->fEffectKeys[s] = 0;
}
}
if (readsDst) {
GrAssert(NULL != dstCopy);
desc->fDstRead = GrGLShaderBuilder::KeyForDstRead(dstCopy->texture(), gpu->glCaps());
GrAssert(0 != desc->fDstRead);
} else {
desc->fDstRead = 0;
}
desc->fCoverageOutput = kModulate_CoverageOutput;
// Currently the experimental GS will only work with triangle prims (and it doesn't do anything
// other than pass through values from the VS to the FS anyway).
#if GR_GL_EXPERIMENTAL_GS
#if 0
desc->fExperimentalGS = gpu->caps().geometryShaderSupport();
#else
desc->fExperimentalGS = false;
#endif
#endif
// We leave this set to kNumStages until we discover that the coverage/color distinction is
// material to the generated program. We do this to avoid distinct keys that generate equivalent
// programs.
desc->fFirstCoverageStage = GrDrawState::kNumStages;
// This tracks the actual first coverage stage.
int firstCoverageStage = GrDrawState::kNumStages;
desc->fDiscardIfZeroCoverage = false; // Enabled below if stenciling and there is coverage.
bool hasCoverage = false;
// If we're rendering coverage-as-color then it's as though there are no coverage stages.
if (!drawState.isCoverageDrawing()) {
// We can have coverage either through a stage or coverage vertex attributes.
if (drawState.getFirstCoverageStage() <= lastEnabledStage) {
firstCoverageStage = drawState.getFirstCoverageStage();
hasCoverage = true;
} else {
hasCoverage = requiresCoverageAttrib;
}
}
if (hasCoverage) {
// color filter is applied between color/coverage computation
if (SkXfermode::kDst_Mode != desc->fColorFilterXfermode) {
desc->fFirstCoverageStage = firstCoverageStage;
}
// If we're stenciling then we want to discard samples that have zero coverage
if (drawState.getStencil().doesWrite()) {
desc->fDiscardIfZeroCoverage = true;
desc->fFirstCoverageStage = firstCoverageStage;
}
if (gpu->caps()->dualSourceBlendingSupport() &&
!(blendOpts & (GrDrawState::kEmitCoverage_BlendOptFlag |
GrDrawState::kCoverageAsAlpha_BlendOptFlag))) {
if (kZero_GrBlendCoeff == dstCoeff) {
// write the coverage value to second color
desc->fCoverageOutput = kSecondaryCoverage_CoverageOutput;
desc->fFirstCoverageStage = firstCoverageStage;
} else if (kSA_GrBlendCoeff == dstCoeff) {
// SA dst coeff becomes 1-(1-SA)*coverage when dst is partially covered.
desc->fCoverageOutput = kSecondaryCoverageISA_CoverageOutput;
desc->fFirstCoverageStage = firstCoverageStage;
} else if (kSC_GrBlendCoeff == dstCoeff) {
// SA dst coeff becomes 1-(1-SA)*coverage when dst is partially covered.
desc->fCoverageOutput = kSecondaryCoverageISC_CoverageOutput;
desc->fFirstCoverageStage = firstCoverageStage;
}
} else if (readsDst &&
kOne_GrBlendCoeff == drawState.getSrcBlendCoeff() &&
kZero_GrBlendCoeff == drawState.getDstBlendCoeff()) {
desc->fCoverageOutput = kCombineWithDst_CoverageOutput;
desc->fFirstCoverageStage = firstCoverageStage;
}
}
desc->fPositionAttributeIndex = drawState.positionAttributeIndex();
desc->fLocalCoordAttributeIndex = drawState.localCoordAttributeIndex();
// For constant color and coverage we need an attribute with an index beyond those already set
int availableAttributeIndex = drawState.getVertexAttribCount();
if (requiresColorAttrib) {
desc->fColorAttributeIndex = drawState.colorVertexAttributeIndex();
} else if (GrGLProgramDesc::kAttribute_ColorInput == desc->fColorInput) {
GrAssert(availableAttributeIndex < GrDrawState::kMaxVertexAttribCnt);
desc->fColorAttributeIndex = availableAttributeIndex;
availableAttributeIndex++;
} else {
desc->fColorAttributeIndex = -1;
}
if (requiresCoverageAttrib) {
desc->fCoverageAttributeIndex = drawState.coverageVertexAttributeIndex();
} else if (GrGLProgramDesc::kAttribute_ColorInput == desc->fCoverageInput) {
GrAssert(availableAttributeIndex < GrDrawState::kMaxVertexAttribCnt);
desc->fCoverageAttributeIndex = availableAttributeIndex;
} else {
desc->fCoverageAttributeIndex = -1;
}
}
